Want to prevent spamming with random image...

[coldfuse228]

Hi, I would like to prevent spamming on my coldfusion form. I see that some sites like Yahoo.com, before a user can click submit to create an account, they have to enter some random text from a randomly generated image before clicking.

Does coldfusion have some api, tutorial, or technique that I can create this random image, any ideas ?

Thank you so much,
C.

[Dan_Bracuk]

google "coldfusion captcha"

[coldfuse228]

Hi Dan, thanks for your reply, I've been researching various captcha's, but the issue is that most of these solutions have label's on them, like if there is a abcCaptcha, then 'abcCaptcha' would be labeled on the image. My company won't let me use that, is there a way to custom make my own, I heard that .NET had some utilities that can generate that, but does coldfusion have some api to do that?

Thanks so much,
C

[Sojovi]

I've used a long time ago the dynamic JPEG generation example that comes with CF 5.
This is the code, but I'm sure you can find a newer version, but work greats.

Regards

[Mr_Black]

For most cases, unless you REALLY want to be 99% secure, there are very simple solutions:

1. Using any graphical editor, generate off-line a set of images. Dependently on your security issues make it large enough. Again in most cases 20-50 images will be more than enough. DIsplay them randomly.

2. Generate set of atomic images, using an editor. Let's say digits and/or letters. Generate a random number. Use every digit (or group of digits) of this number, as index into your atomic set. Display a combined image. For example, if random number is 12345, you would display five images "1", "2", "3", "4", "5", which look like a single image.

(1) is simpler. (2) requires more programming, but can yeild practically unlimited number of different images.

[Guest]

Easycfm.com has a captcha web service that I've been using on a number of sites. The images are not so obfuscated as to be unreadable, but the spam submissions have dropped to 0. I found the link to the web service on xmethods.net

[coldfuse228]

Hi all!, thank you so much for the comments and replies!, I'm trying to use all of your suggestions and code, I was wondering if anyone knows how to use audio to "say" the captcha text, I see some sites do that and wondering if anyone has any samples of that?

Thanks so much,
C

[Guest]

Try CFX_CAPTCHA

[coldfuse228]

Hi lan99, thanks for your reply, I am going to check out that site.

Thanks again,
C